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曙光油田D块热采水平井采出程度高,地下亏空大,地层能量不足,而且水平段动用不均情况严重,导致吞吐效果变差。目前针对热采水平井的增产措施作用单一,局限性大,不能同时解决上述两个问题,为此创新研究出复合调剖技术。复合调剖技术需要既能耐长时间高温,又不存在固相颗粒堵塞水平井筛管的调剖剂,由此研发了一种新型无固相高温凝胶调剖剂。为了解决新型无固相调剖剂封堵强度低、不耐高温的问题,引入了有机交联剂(酚醛树脂)和热稳定剂,成功提高了调剖剂封堵强度,并使调剖剂耐温指标达到了250℃左右。另外还引入了缓成胶剂(草酸),使得更多的药剂进入高动用层封堵高渗层。复合调剖技术通过向油井同时注入二氧化碳、新型调剖剂及表面活性剂,将补充地层能量与调整水平段动用相结合。复合调剖技术在D块已实施62井次,有效52井次,阶段有效率83.9%,平均单井注汽油压上升0.9MPa,平均单井增油563t,油汽比提高0.03。
Shuguang Oil Field D Block thermal recovery horizontal wells with a high degree of mining, underground shortfall, lack of stratigraphic energy, and uneven utilization of the horizontal section of the situation is serious, resulting in poor throughput results. At present, the stimulation of horizontal wells for thermal stimulation has a single and limited effect on stimulation measures, which can not solve the above two problems at the same time. Therefore, composite profile control technology has been innovated. Compound profile control technology needs a profile control agent which can resist long time high temperature and does not block horizontal well screens by solid particles. Thus, a novel non-solid phase high temperature gel profile control agent has been developed. In order to solve the problem that the new non-solid profile control agent has low blocking strength and high temperature resistance, the organic cross-linking agent (phenolic resin) and the heat stabilizer are introduced to improve the blocking strength of the profile control agent and to make the profile control agent Temperature index reached about 250 ℃. In addition also introduced a slow gelling agent (oxalic acid), making more drugs into the high-use layer plugging hypertonic layer. Compound profile control technology by adding oil and gas into the well at the same time, carbon dioxide, a new profile control agent and surfactant, will complement the formation of energy and adjust the level segment combined. The composite profile control technology has implemented 62 wells in block D, effective 52 wells and an effective rate of 83.9% in the stage. The average single-well injection gasoline pressure increases 0.9MPa with an average of 563t in single well and an increase in oil-steam ratio of 0.03.